LanguageFeatures/Control-flow-collections/type_promotion_A01_t01.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion As with the if statement, the condition expression of an if
/// element induces type promotion in the "then" element of the if when the
/// condition expression shows that a variable has some type and promotion isn't
/// otherwise aborted.
///
/// @description Checks that the condition expression of an if element induces
/// type promotion in the "then" element of the if when the condition expression
/// shows that a variable has some type.
/// @author sgrekhov@unipro.ru

import "../../Utils/expect.dart";

class A {
  int get a => 0;
}
class C extends A {
  int get c => 1;
}


main() {
  A a = new A();
  A c = new C();
  var v1 = [
    if (a is C) a.c,
    if (c is C) c.c
  ];
  Expect.listEquals([1], v1);
}